Thanks Fil for creating this topic (yes, you did the right thing!), and thanks Crawford for contributing this extension! I completely missed it.

The installer has been buggy at times, you might have run into this. If this is the case, the author would need to build the package again. In any case you can unzip the package and copy the files into the twiki directory, preserving the directory structure.

I recomment to convert this contrib into a plugin and name it StarRatingPlugin. That way one can simply use a %STARRATING{ name="cool_factor" value="3" stars="10" }% to add a hidden HTML input field and a set of stars to pick a rating. I have just done that conversion with the ColorPickerContrib / ColorPickerPlugin.